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Modernz 62
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/* *\
/ * * \
/ * * \
/ * * \
/ * System Vulnerabilities * \
| * * |
| * * |
| * * |
| * Another Modernz Presentation * |
| * * |
\ * by * /
\ * Multiphage * /
\ * * /
\ * (C)opyright August 5th, 1992 * /
\ * */
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===========================================================================
AT&T /usr/etc/rexecd Vulnerability
---------------------------------------------------------------------------
Information concerning a vulnerability in AT&T TCP/IP Release 4.0
running on SVR4 systems for both the 386/486 and 3B2 RISC platforms.
The existing error, in the remote execution server /usr/etc/rexecd, has
been corrected, and a new executable for rexecd is available from AT&T
by calling 800-543-9935. Patches may be obtained outside the U.S. by
calling your local technical support. The numbers associated with the
fix are 5127 (3.5" media) and 5128 (5.25" media).
The problem does not exist in TCP/IP release 3.2 for SVR3, or any earlier
versions of the TCP/IP product running on either the 3B2 or 386 platforms.
The version of TCP/IP distributed with SVR4 by UNIX(r) System Laboratories,
Inc. (a subsidiary of AT&T) does not contain this vulnerability.
UNIX(r) is a registered trademark of UNIX System Laboratories, Inc.
---------------------------------------------------------------------------
I. Description
A vulnerability has been identified where root privileges may be
accessed through the use of /usr/etc/rexecd.
II. Impact
A user on a remote machine may be able to run commands as root on
the target host (the host running the affected /usr/etc/rexecd).
III. Solution
1. Administrators of affected systems should execute, as root, the
following command to immediately turn off access to rexecd until
the new binary can be obtained.
# chmod 400 /usr/etc/rexecd
2. Obtain and install the new patch. The fix will be supplied as
one diskette, and it comes with one page of instructions documenting
the procedure to replace the existing /usr/etc/rexecd binary.
---------------------------------------------------------------------------
AIX REXD Daemon Vulnerability
---------------------------------------------------------------------------
Information concerning a vulnerability with the rexd daemon
in versions 3.1 and 3.2 of AIX for IBM RS/6000 machines.
IBM is aware of the problem and it will be fixed in future updates to
AIX 3.1 and 3.2. Sites may call IBM Support (800-237-5511) and ask for
the patch for apar ix21353. Patches may be obtained outside the U.S. by
contacting your local IBM representative.
The fix is also provided below.
---------------------------------------------------------------------------
I. Description
In certain configurations, particularly if NFS is installed,
the rexd (RPC remote program execution) daemon is enabled.
Note: Installing NFS with the current versions of "mknfs" will
re-enable rexd even if it was previously disabled.
II. Impact
If a system allows rexd connections, anyone on the Internet can
gain access to the system as a user other than root.
III. Solution
CERT/CC and IBM recommend that sites take the following actions
immediately. These steps should also be taken whenever "mknfs" is run.
1. Be sure the rexd line in /etc/inetd.conf is commented out by
having a '#' at the beginning of the line:
#rexd sunrpc_tcp tcp wait root /usr/etc/rpc.rexd rexd 100017 1
2. Refresh inetd by running the following command as root:
refresh -s inetd
